Differential mechanism for front and rear driven vehicles



' l I. I. WIGGINS. DIFFERENTIAL MECHANISM FOR FRONT AND REAR DRIVEN VEHICLES.

V APPLICATION FILED APR. K2 1917- 1,350, 194. Patented Aug. 17, 1920.

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UNITED STATESY PATENT OFFICE.

ISAM ISAAC WIGGINS, OF MCINTOSH, GEORGIA.

DIFFERENTIAL MECHANISM FOR FRONT AND REAR DRIVEN VEHICLES.

Specification of Letters Patent.

Patented Aug. 17, 1920.

Application filed April 12, 1917. serial No. 161,504.

To all whom t may concern Be it known that I, IsAM ISAAC IYIGGINS, a citizen of the United States, residing at McIntosh, in the county of Liberty, State of Georgia, have invented a new and useful Differentlal Mechanism for Front and' Rear Driven vVehicles; and I do hereby declarethe lfollowing to be agfull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use ythe same.

This invention is an improved automobile.

for use on front and rear driven motor vehic'les.

The invention consists briefly; of a cen-.y

trally disposed differential gearing which in turn communicates with and operates differentials on both forward and rear axles, means being provided to permit the front wheels to ube steered while receiving power from the engine.

In the drawings: f

Figure 1 is the plan view-"of a motor in which the 1n,- I

' f Y palr of axially alined and abutting driving truck, showing the manner vention is applied. l l

Fig. 2 is a section on line 2-2 of Fig. 1. Fig. 31s a longitudinal section through the differential shaft is geared. y y y Referring to the drawings 1 designates a truck frame on which the engine2 is mounted, a casing 3 centrally dlsposed' on the framecontaining a differential gear 4 and a gear 5 carried by'the engine shaft. y The gears 4 and 5 mesh, thus the rotation of the engineshaft is transferred to thedif feren tial gear 4.l

The casing 3 is provided with th'e bearings 6 which are integrally formed frin the end walls thereof. The` bearings 6 adjoin the hemispherical members 7 `whichhouse the several gears constituting the differential,

-the gear 4 rotating between these hen1i-` vspherical members. The short shafts 8 are journaled in the bearingsv 6 and where they projectv outside of the bearlngs universal joints 9 are connected. Vithin the hemi-v spherical members' 7 the shafts 8V abut eachVv other and a beveled gear 10 is keyed to each close to their abutting ends. The gear 4 ,is l

gearing to which the engine supported between the gears 10 on the ends of the two shafts 8 around which it is ca pable of rotation. On a radial stud 11, the gear 4 carr1es the-beveled gear 12 which meshes wlth both of the gears 10. The

hemispherical members 7 are supported by` thedegs 13 which are attached to thel bottom of the casing 3.

The shaft 14 connects-'with the universal i ljoint 9 atvthe rear of the casing l3 and is journaledil 1n the differential` gear case 15,

connecting with the differential gearin therein in the same 'manner that the shaft y16 connects with the differential gearing in the casing 17.4 I The shaft 16 is journaled in the casing 17 and drives av differential therein., which differential drives the conventional form of driven front axle through shafting 18 andbevel gears 19. The rotation of the engine imparts motion' to the] centrally disposed differential gear and this in turn transmits it to the front and rear differentials, thusimparting power to all four wheels, the front wheels receiving their power throughlthe bevele/d gears 19 trains. i

That is claimed is sov A differential mechanism comprising a y shaftsfa bevel, gear keyed to each of the abutting ends of the driving shafts, a spur gearintermediate the two bevel gears and mounted loosely on the axial abutting ends of the two parts ofthe driving shafts, said spur gear having a radial pin, a` bevel pinion journaled on said pin at right angles to v 4theaxis o f said spur gear and meshing with theV bevel gears,y a casing surrounding the bevel gears and the central portion of the ,y

spur gear and havingits outer edges spaced from the teeth of said spur gear, sald caslng comprlsing two sem1-spher1cal sectlons,

'the outer ends of said s'emi'sphericalI sec'- tions forming supporting means for the axially alined driving shafts, and means for supporting the sections ofthe casing andv its bearings.

sus

In testimony whereof I have signed my e naine tothis specification in the presence 0f twov subscribing witnesses; 1 ISAM ISAAC VIGGINS.

`VVitnesseS.: 4

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